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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04522db975f3174bb7b533016c444a2a540b4c281dc469470118d7490b14197' 
  AND token = 'Pllr8iVZsHTG+4hfzOgXC6ketiL0dTowixGmGhiVdL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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