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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8318624f80ce953180d44914ce28387b21695217568b5393bab8f2c05b4b7b' 
  AND token = 'alpsOHkglj+8w4R2Ijlf9uDxy0Fje3m+qgok2O/Yikw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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