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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79964d24eb7a0ea43fb7dbdb2d3b7e030e4df7f838aa25d88791a86b421d5be8' 
  AND token = 'UmJKq5Wq3cCHzNSuOA4evjVm8Pe7tyt3Fliba2Jg1Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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