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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e65015a882310a7e230f092a6a826ea13742a9a6760fe1551fa484951b691b85' 
  AND token = 'QTIBuujj8mafuds0t5P5vbaJVbAEdlGQpwqN2AxAFZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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