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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd58a9f1db5972e0c499241d1a75f4777f4ee0d4ab0081df6a0b7e41bc70107' 
  AND token = 'xyuFbftSMPo+mBmEhhR7zDo2/MuyHzd4OXH5eqgObZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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