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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46c3e61183d0076b1743ee51514095b31ed3dd35e0f4bdc2cb4cbf20f3c2d561' 
  AND token = 'hU4dmSsynJ3atb6IRXU7fMKghadZ0LeIXb1Izot2fx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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