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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36678d984d02a2d787f3e0345bd9792f35aafa2825d0490ce595565b26244670' 
  AND token = 'S0bt8t02Wb7XokJkopzEAK8F2RknUj/9W/opP3nrBM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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