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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f2441af24530295b7aa44b575ce0c48399a43c209ea898cfca59c1d462e3d0' 
  AND token = 'FgK+0PgqjOIJPfO5DfxgDLGrqDS8brdbppe4oPP3W0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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