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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7113b2881d974e0667f44e996d9d85c83d65d5e5040915abbc4e3154fa63d24' 
  AND token = 'EoElFh2yiRnhmU/yQJ8jrKQmKm7KrKNtjIfC/eawaLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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