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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817c5b48bcf4ca17e7a80a9cd02cb3df98ce63e1591b2b1c6b0b0b11e8abf785' 
  AND token = 'U0ER/2ewafV/O1HgvzN8YZXWaqWhPMbgyqcRCbDJDmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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