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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a6c7d02a6188f36b07e79531bee4ce18a298271b5faf420183dcafa2ebeb8d6' 
  AND token = '/QsrWBy2BNC7GOkAMJIsRpCQr7p0lmBoEko2buEC0Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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