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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e051f982a6ade1b079d77564ee78a7a6c2be05652baff52c942d0866ba5ce050' 
  AND token = 'hH27phNUm6NaStVweBtvQCCR6vD0ji6aRoZksxGPxgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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