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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ab32586411b16c91562dcbe2ba031f30d59ca3565f67317cbf6ce9a0d493b7' 
  AND token = 'WDj6sATeXAoV+MbeHRajRv7oZTeY9TBuI5jPGQ+o9T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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