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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f3c66f8f409a6114c6eb1cf712726ef11364071946a160c8659ba8597b689f' 
  AND token = 'EivTjkKb8Amc49hwkPgryQqy8ZAB9Kyq/L7wKVCSvc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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