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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cdfc04737076277578f32ee4dc239e9a4337056c6e18c4f4fc15626f7fe8082' 
  AND token = 'Z/Wxil0QGpNI+f5R0xVnErb5f5HvSS3mPdPvfs9DQ4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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