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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb5768699e23475cbad5317981e5f5fd2970bf423cfae1cb6d0c7d52cea172f1' 
  AND token = 'Uhzwg0tCQMiPcVDK5s+U9o5BLDtYDQ9P9X9aqNuitio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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