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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d13b91860f9221c773bc89285ecfd34f48c671a3d7e41e0905010c97e773c1' 
  AND token = '/2wZJ+Wwo6Cy7D7PLV62KBM9e3X6+/Xiu5Dc6TqOe9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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