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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aad912f5defaa29f64d116e68b7d6dcd5eeb43ce3e412d165ad8c86dd3b8807' 
  AND token = 'pQ346wKbgXsCPS28TNdgsOlC6ZFUw9maP7R/9FITtMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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