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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96075f6ac59d2b59acafec0a018670d9b2a2c4c406d6e1428dd156f0d23f88cd' 
  AND token = 'L6EIdTMADidsa1mT58k987DL4JoJP0lsLaZ4GpQjUpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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