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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a844fdf8510c2e8e830a7195fc95efc201c9a0a92f748f64e7051bfb3eecac8e' 
  AND token = 'uqIpaxwt8Seh4R8v3Wy/6PvsorpCAdqDkb/Ytj3IoNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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