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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f770e12033be0b0ca6ffa4b7409a323e470728c5633085b1abc90aab72a2b14a' 
  AND token = 'zJ7rRERluCqY7BdJ7ipogsuqLQ6hqTCUewqF7ZOJK3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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