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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46fac8edf699181ce0ca0d07374102dda96c763fee93ed65053fef6c27e65c1b' 
  AND token = 'LQpdanvjEmAvR9V7EmInS2CrwH55oOao2RLjE8xp6sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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