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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e36aefc838a96305cfe8cfdd1596d1b4c73784ea627fb5f01d1c6579fd2f7d77' 
  AND token = '8UL6flOuiGB+olYhX55tJBgDf5LojHaTFhccl/bpxOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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