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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d82d8e9d63844c4697fd02cc99283f138417929cb3453eb51c6c19244398d1f' 
  AND token = 'sPh7ItiaOoSQChth0HX+4knwutl6ACzNoeWzp48pmcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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