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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470bbb16d19daf2cd2621b9c5c7ad4a2ddbe6fad4349728e3d008354b9bb7577' 
  AND token = 'q45Mvm7hWIn3cIr6Ac/pTB4TTmNRO93oPowesdDC8HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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