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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4beda7f43f23f347e22893198855a7639f5e144303439f05cecb3cc0459a5e2' 
  AND token = 'MJMBv9y71XHk91TqCbfZ0cuLMg/Hbz+o/CiHeDC1j5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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