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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e489b3f71764aefcd6cfb65f06d8955601b4eb7458616dcdfcde2d323b42b1d' 
  AND token = '/TdG4/nU3wrPvMHDIkhV/yWm101Ala84y3ZLwoKWPl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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