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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7458b9613ae786149c46eddcb9aae233945f35d7d113854a2a5c3257b9ae1fa' 
  AND token = '7nsHcBjAkUo/BuTrQL7iAdnpU+8sg/QNrlGQCafvw8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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