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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '574e40ef31c3a731878d0e0776d38de7d3b1be936ee7afe4f81f6ddf19530af5' 
  AND token = 'Bht7Bye17McF37E/ZxSTOvm6OXGJ/AT/M9WNLVD+Lgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}