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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0376d13a04a9516c7966ece70854721108ab9e182fa0a17663c9169ca22c8b3b' 
  AND token = '5+ErrLDh1rEA5BOkWaIa/nH9O1fOh+hag2dm9/JpeM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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