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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138f30d4afba586ecbd8a15d7093ba86f538d1de2d9a2767bceb74156fd17306' 
  AND token = '14I5y2Bxw6duGQcZIFulTWpsDUhgpe7A2TYQHP7IhyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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