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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c066df978b7a2f34c3d2a786b4969d6df3aa96b8cb3569424ddce5e342aff5ff' 
  AND token = '7h3NXlI2x2y0l8vn0+y+GbQiTSZ0BO6SF2Y8rYPOzeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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