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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cfa02a2fbff196ff5d21aa50e0fedfccd052d8fde95b22f6f7e495031c02ade' 
  AND token = 'w/+LXGXE9LYrQ5EppAuJNH55tSb8EBSFtW12j5t3AbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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