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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eacdba6318cb321e0311942278af8a6e112cbae68a4d47ba3b8d2f3c13b47a2b' 
  AND token = 'uq5iS1jLI+1wcSQIirO2NvldOsCbZAklTDwq7IptLF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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