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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c651d01677d8900924e189e1b18bad02d79483a0de4f6c65a4840d986ac2cb' 
  AND token = 'foIClFpKL5+R5O9jGPpgTF9rkiFLVjVtnbBx2ynL6e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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