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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7d05993dcc042f276e5ca300af86bfcfd37aef3e4b1c3511830b4919d60c84' 
  AND token = '1It82Yg9IuyS+W4om4RP6kiF6bDOl4q/+YmkVDTrUUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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