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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7a6b7ec246ffea0c2a192766fe3fa7597ebbf929dd9c1b6d558f2b6e1ff76d' 
  AND token = 'syC3oEZHo4QPiQX6ZeNUUFXYlRn9/UN8mS4ebLfxMwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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