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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9a4046ff0d1a68c14e46307f484e8aeb1a36e3aaf08ecdaef4d42233f33cf9' 
  AND token = 'WSlgK6OHVNDZW+ZconM99jeTuNi1r79+WqBCiIaU6qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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