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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5d8204bc7b37f60669c0e279dd9a7e7ff0fa25070bd50bdbedf9ab72bc4c03' 
  AND token = 'hy5baNjusFfVc+SNpITEH1V+GuoJohkTlY4j97okkW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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