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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2715cb142b4f7e264c78442d01041cb477a095604eadde0b06d8922a129ef9' 
  AND token = 'YYYxUwD4ejtvxzD0/nTmBwf1DeKWznWiAS4xNz9Q6Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

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