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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac964b4780d7d1ec6597781e482b725e09be353739804046aac460cdfa13f43' 
  AND token = 'fa2af7cJJ/Kigp4GZd2kmUmn+ydJ2Qd1b1IznHw+dt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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