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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e0ff49cb2faa69c9674390d3742c8e1af70184957010e866ecc9f74818c1c6' 
  AND token = 'LqZfOfOpifUtytulPAvqfIN8lTa1fMnJY0d7M50lSYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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