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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6373ab6b731fd3da3097044cb98313d01fc54b4c4ae6cfbcbf81ae59f052f17' 
  AND token = 'EAEjhTG4IUq+tamzgIrbrF8gKM7KsScgXATs3V7y4po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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