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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27908e4918bacaf1650c40921c947db31aa234d9c643ec560abe4bccc0d38468' 
  AND token = 'joRhh4MzborMOcmwOxMkp7Aw+EVU/2hX6ANw4O7UDb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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