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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f7f662f5051862a496725db0ab39a9fac3a53c77f9284fbf5f182cf616f0fc1' 
  AND token = 'bMwbhA9SoQBoKAkMWXXzjGPOWVzOeS3SAQhDb3+1KJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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