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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8fd2bd5513dd7c5206a00f3044d6fafd49f365da7c17d2208ed12dcd0c16fdf' 
  AND token = 'An4LVR1f+rt4g5XI3GYYiOlnk4qQHVqkhDtMvJ0b5nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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