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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d18e881dd3e9fd44ffb48469ac419a64d8c693819721b2aec33790db8726d0' 
  AND token = 'IIwy8cszpQJjVzssP3PjYsAQwwXXtT7um8hjh3ziECU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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