SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b068b5f928f1bcc8e70d2fd4c2c77100c2826f088e4e5c30d09aa03b263333e' 
  AND token = 'vmsBMQofGbyruyBhi+iiLgIL2wUHKfLkIZmoNUVKg8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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