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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0579b49452c6d1cf2862742b6b117a7877a0b02bc70eb1bd6667227ae6c1a5a6' 
  AND token = 'uZV4rth6IG91nlOiyZYxGoza21pdxay/g95OTj9Ds7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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